Christmas Day travel could be affected by black ice

Most of New England woke up Christmas morning with no snow on the ground, but forecasters are warning people across the region to be wary of black ice on roads and walkways.

Temperatures dove below freezing overnight and National Weather Service forecaster suggested people take extra caution on roads and sidewalks through mid-morning. That’s when temperatures should climb back above freezing, where they will stay for most of the day.

Driven by clear skies and plenty of sun, that temperature may even hit 40 degrees Tuesday near Boston, forecasters said. It will fall back below freezing overnight, with lows in the 20s around Boston, but officials forecast warmer air on the way for the end of the week.

Peter Bailey-Wells can be reached at peter.bailey-wells@globe.com. Follow him on Twitter @pbaileywells.